KONGL. SVENSKA VETENSKAPS-AKADEMIENS HANDLINGAR. Bandet 23. N:o 19. 
THE ASCOCERATIDAE AND THE LITUITIDA 
THE UPPER SILURIAN FORMATION OF GOTLAND 
DESCRIBED 
BY 
G. LINDSTRÖM. 
WITH SEVEN PLATES. 
COMMUNICATED TO THE R. SWEDISH ACADEMY OF SCIENCES DECEMBER lilTtH 1889. 
STOCKHOLM 1890. 
KERIET. OP. A 
KONGL. BOKTRY YCKERIET. P. A. NORSTEDT & SÖNER. 
